Electrode for electric resistance welding

Patent metadata

Field	Value
Publication number	US-10632562-B2
Application number	US-201715657507-A
Country	US
Kind code	B2
Filing date	Jul 24, 2017
Priority date	Aug 8, 2016
Publication date	Apr 28, 2020
Grant date	Apr 28, 2020

Abstract

A sliding member integrated with a guide pin is inserted into a guide hole of an electrode main body. An elastic ring is integrated with the guide pin under a state in which the guide pin passes through the elastic ring. A portion of the sliding member has a pressurizing end surface configured to press the elastic ring against an inner end surface of the guide hole. When the pressurizing end surface presses the elastic ring against the inner end surface, flow of the cooling air is interrupted. When the elastic ring is away from the inner end surface, the cooling air is allowed to flow.

First claim

The invention claimed is:

1. An electrode for electric resistance welding, the electrode comprising:
an electrode main body having a guide hole that comprises a large-diameter hole, a small-diameter hole having a diameter smaller than a diameter of the large-diameter hole, and a communication hole having a diameter smaller than a diameter of the small-diameter hole and opening at an end surface of the electrode main body;
a guide pin having a circular cross section, which projects from the end surface of the electrode main body to pass through a pilot hole formed in a steel sheet part, and is made of a heat-resistant hard material comprising a metal material or a ceramic material;
a sliding member having a circular cross section, which is made of an insulating synthetic resin material and is integrated with the guide pin, the sliding member comprising a sliding portion that is slidably fitted into the large-diameter hole of the guide hole and an extended portion that extends from the sliding portion into the small-diameter hole of the guide hole;
a ventilation port formed in the electrode main body, which is configured to introduce cooling air for exhausting impurities and for cooling into the guide hole; and
an elastic ring made of an elastic material to be integrated with the guide pin under a state in which the elastic ring is fitted into a circumferential groove formed in an outer peripheral surface of the guide pin and an outer peripheral surface of the elastic ring is in contact with an end surface of the extended portion of the sliding member,
wherein the sliding member is configured to press the elastic ring with the end surface of the extended portion, as a pressurizing end surface, against an inner end surface of the small-diameter hole of the guide hole; and
wherein flow of the cooling air from an air gap between the extended portion and the small-diameter hole to an air gap between the guide pin and the communication hole is interrupted when the pressurizing end surface presses the elastic ring against the inner end surface of the small-diameter hole, whereas the cooling air is allowed to flow from the air gap between the extended portion and the small-diameter hole to the air gap between the guide pin and the communication hole when the elastic ring is away from the inner end surface of the small-diameter hole.

2. An electrode for electric resistance welding according to claim 1 , wherein the pressurizing end surface is opposed to the inner end surface of the small-diameter hole, and a center portion of the elastic ring is positioned between the pressurizing end surface and the inner end surface of the small-diameter hole.

Assignees

• Aoyama Shoji
• Toyota Motor Co Ltd

Inventors

• Suzuki Jyunnichi
• Aramaki Takami
• Ninomiya Kenji
• Kudou Hiromi
• Aoyama Yoshitaka
• Aoyama Shoji

Classifications

• B23K11/30 Primary

  Features relating to electrodes · CPC title

• B23K11/3054 Primary

  Cooled electrodes (B23K11/3018, B23K11/3045 take precedence) · CPC title

• B23K11/0046

  the extremity of a small piece being welded to a base, e.g. cooling studs or fins to tubes or plates · CPC title

• B23K11/3009

  Pressure electrodes · CPC title

• B23K11/3036

  Roller electrodes · CPC title